chemical engineering stoichiometry MCQs – Page 5

Practise multiple-choice questions from chemical engineering stoichiometry for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering stoichiometry Mcqs
81. Maximum alumina content in high alumina refractory can be as high as ____________ percent?
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A. 70

B. 30

C. 50

D. 90
82. During a phase change process like sublimation, vaporisation, melting etc., the specific ____________ does not change?
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A. Gibbs free energy

B. Enthalpy

C. Entropy

D. Internal energy

83. For a neutral solution (pH = 7), the value of [H+] [OH-] is equal to_________________?
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A. 0

B. 1

C. 1

84. Outer combustion chamber of blast furnace stove is lined with _______________ bricks?
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A. Fireclay

B. Chrome magnesite

C. Silica

D. Zirconia

85. _____________ kg of CaC03 on heating will give 56 kg of CaO?
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A. 100

B. 1000

C. 56

D. 144

86. The osmotic pressure of a solution increases, if its _____________ is decreased?
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A. Solute concentration

B. None of these

C. Volume

D. Temperature

87. Silica bricks are never used for lining the_________________?
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A. Dome of blast furnace stoves

B. Beehive coke ovens

C. Roof of open hearth furnace

D. By-product coke ovens

88. Real gases approach ideal behaviour at___________________?
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A. High pressure & low temperature

B. Low pressure & high temperature

C. High pressure & high temperature

D. Low pressure & low temperature

89. Beryllia (which is used in making crucibles for melting uranium & thorium) is superior to alumina in all respects for high temperature (> 1900C ) use, except______________?
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A. Cost

B. Fusion point

C. Electrical conductivity

D. Thermal conductivity

90. Unit of power is____________________?
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A. Joule

B. Watt

C. Joule/Second

D. Both B. & C.
91. The vapour pressure of a solution (made by dissolving a solute in a solvent) is ____________ that of the pure solvent?
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A. Equal to

B. Either more or less; depends on the solvent

C. Less than

D. More than

92. Cox chart which is useful in the design of a distillation column (particularly suitable for petroleum hydrocarbons) is a plot of the_____________?
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A. Log (temperature) vs. log (vapor pressure)

B. Temperature vs. log (vapor pressure)

C. Vapor pressure vs. log (temperature)

93. The vapor pressure of a substance, at its melting point, is _____________ in the solid state as compared to that in the liquid state?
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A. Less

B. Either A. or B.; depends on the nature of the substance

C. Same

D. More

94. At higher temperature, molal heat capacities of most of the gases (at constant pressure) ____________ with increase in temperature?
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A. Increases linearly

B. Remains unchanged

C. Increases

D. Decreases

95. In the reaction, Ca + 2H2O = Ca(OH)2 + H2; what volume (c.c.) of hydrogen at STP would be liberated, when 8 gm of calcium reacts with excess water ? (Atomic weight of calcium = 40) ?
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A. 1120

B. 2240

C. 0.4

D. 4480
96. A vessel of volume 1000 m3 contains air which is saturated with water vapour. The total pressure and temperature are 100 kPa and 20C respectively. Assuming that the vapour pressure of water at 20C is 2.34 kPa, the amount of water vapour (in kg) in the vessel is approximately ?
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A. 34

B. 17

C. 20

D. 25

97. One kg of saturated steam at 100C and 1.01325 bar is contained in a rigid walled vessel. It lias a volume of 1.673 m3. It cools to 98C; the saturation pressure is 0.943 bar ; one kg of water vapour under these conditions has a volume of 1.789 m3. The latent heat of condensation (kJ/kg-1 ) under these conditions is___________________?
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A. 2263

B. 40732

C. 2676

D. 540

98. For an ideal gas, the compressibility factor________________?
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A. Is unity at all temperature

B. Zero

C. Is unity at Boyles temperature

D. Decreases with pressure rise

99. Pick out the wrong statement about the recycle stream in a process ?
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A. Recycling in a process does not help in getting higher extent of reaction

B. Recycling is exemplified by refluxing back a part of the distillate to the distillation column to

C. ntity of the same reactant entering the process as fresh feed is called combined feed ratio

D. ntain the quantity of liquid within the column

E. Recycling in a process stream helps in utilising the valuable reactants to the maximum with

F. The ratio of the quantity of a reactant present in the reactor feed of a recycling operation to the

100. The elevation in boiling point of a solution is proportional to the ______________ of the solution?
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A. Molal concentration

B. Normality

C. Reciprocal of the molal concentration

D. Molarity